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In a test of corrosion resistance, a sample of 62 Incoloy steel specimens were immersed in acidified brine for 4 hours, after which each specimen
In a test of corrosion resistance, a sample of 62 Incoloy steel specimens were immersed in acidified brine for 4 hours, after which each specimen had developed a number of corrosive pits. The maximum pit depth was measured for each specimen. The mean depth was 850 m with a standard deviation of 153 m. The specification is that the population mean depth is less than 900 m. Find the P-value for testing H0 : 900 versus H1 : < 900
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